Time Series Analysis of Fish Passage
Overview
Willamette Falls dam includes a fish ladder that was built in 1882. Since 2001, they’ve collected data on fish passage to track the population of fish species. We can utilize time series analysis to determine how the fish population has changed over time, and whether there are trends or annual changes that occur.
Data is stored by each fish species and daily observed counts. Any date where no data was observed (i.e. NAs) is replaced with a zero value. We’ll utilize data until the start of 2011.